If Mr. Biden wins — and Kamala Harris, who would be his vice president, becomes the tie-breaking vote in a prospective 50-50 Senate — Democrats will need to gain a net total of three seats to take control.
The party sees prime seat-flipping opportunities in Colorado and Arizona. One Democratic incumbent, Senator Doug Jones of Alabama, is viewed as an underdog in his race. Republicans see another Democrat, Senator Gary Peters of Michigan, as potentially vulnerable, too.
So where might Democrats find the extra wins they’d need? Maine, North Carolina, Iowa, Georgia, Montana, South Carolina, even Kansas. They don’t need to win them all. But they are effectively forcing Republicans to play defense across the map.
Source: Elections - nytimes.com